so free speech should be banned by people that hold unpopular beliefs or don't think like you? (not defending scum nazis here but everyone)
Nope. Unpopular beliefs is one thing - preaching that everyone who is not them should be killed off is counter to species and individual survival and should NOT be tolerated.
In other words, Nazis announce that they are our enemies and want to see the rest of us dead. I'd call that a clear and open threat, wouldn't you?